Rule 8.3 - RIO TINTO PLC

FORM 8.3

    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE
              (Rule 8.3 of the City Code on Takeovers and Mergers)


1.   KEY INFORMATION

Name of person dealing        BARCLAYS PLC
(Note 1)
Company dealt in              RIO TINTO
Class of relevant security    ORD GBP0.10
to which the dealings being
disclosed relate (Note 2)
Date of dealing               17 December 2007

2.   INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a)  Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)

                            Long                     Short

                      Number       (%)         Number       (%)

(1) Relevant      47,835,503      4.80%    2,378,243       0.24%
securities
(2) Derivatives    2,301,863      0.23%      303,729       0.03%
(other than
options)
(3) Options and      204,131      0.02%    1,303,531       0.13%
agreements to
purchase/sell
Total             50,341,497      5.05%    3,985,503       0.40%


(b)  Interests and short positions in relevant securities of the company, other
     than the class dealt in (Note 3)

Class of                    Long                     Short
relevant
security:

                  Number              (%)   Number              (%)

(1) Relevant
securities

(2) Derivatives
(other than
options)

(3) Options and
agreements to
purchase/sell

Total


  (c)  Rights to subscribe (Note 3)

Class of relevant security:   Details



3.   DEALINGS (Note 4)

  (a)  Purchases and sales

Purchase/sale Number of Securities Price per unit
                                   (GBP)
Purchase      17,860               50.1200
Purchase      84,323               50.5275
Purchase      36,051               50.1378
Purchase      190,369              50.1449
Purchase      2,268                50.1585
Purchase      206                  50.6448
Purchase      540                  50.3005
Purchase      2,343                50.0185
Purchase      292                  50.6191
Purchase      5,550                50.4593
Purchase      33,587               51.7600
Purchase      176                  50.6563
Purchase      3,067                50.6404
Purchase      1,022                50.5306
Purchase      67                   50.1200
Purchase      5,936                50.2586
Purchase      2,411                50.0463
Purchase      67,458               50.5275
Purchase      82,651               50.2274
Purchase      259                  50.1517
Purchase      16,608               50.1000
Purchase      176                  50.6500
Purchase      200                  51.1333
Purchase      16,865               50.5275
Purchase      841                  50.3859
Purchase      82,651               50.2274
Purchase      113,478              50.0899
Purchase      1,567                50.2969
Purchase      21,024               50.1200
Purchase      21,812               50.1457
Purchase      21,905               50.4925
Purchase      1,054                50.2400
Purchase      107,928              50.0709
Purchase      2,411                50.0463
Purchase      176                  50.6500
Purchase      21,024               50.1200
Purchase      50                   50.2868
Purchase      3,067                50.6404
Sale          60                   50.6008
Sale          2,268                50.1540
Sale          540                  50.2959
Sale          40                   50.5875
Sale          3,067                50.6404
Sale          2,343                50.0110
Sale          5,781                50.1200
Sale          80                   50.2933
Sale          44                   50.6200
Sale          176                  50.6500
Sale          2,411                50.0463
Sale          1,567                50.2918
Sale          2,319                50.5632
Sale          5,936                50.2586
Sale          176                  50.6500
Sale          85                   50.2351
Sale          82,651               50.2274
Sale          259                  50.1517
Sale          14                   50.5875
Sale          56                   49.9325
Sale          21,812               50.1457
Sale          5,550                50.4593
Sale          1,022                50.5306
Sale          841                  50.3859
Sale          59                   50.5851
Sale          107,928              50.0709
Sale          100                  50.7550
Sale          36,051               50.1287
Sale          5,936                50.2586
Sale          1,022                50.5306
Sale          206                  50.6372
Sale          190,369              50.1449
Sale          21,905               50.4925
Sale          100                  50.5175
Sale          1,054                50.2400
Sale          259                  50.1517

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         2343          50.0185
CFD            Short         2411          50.0463
CFD            Short         36051         50.1377
CFD            Short         21812         50.1457
CFD            Short         540           50.3004
CFD            Short         21905         50.4925
CFD            Short         3067          50.6404
CFD            Short         176           50.6563
CFD            Long          259           50.1516
CFD            Long          2268          50.1539
CFD            Long          1054          50.24
CFD            Long          1567          50.2918
CFD            Long          841           50.3859
CFD            Long          1022          50.5305
CFD            Long          213           50.63
CFD            Long          206           50.6371


(c)  Options transactions in respect of existing securities

(i)  Writing, selling, purchasing or varying

Product name,   Writing,          Number of          Exercise  Type, e.g.      Expiry   Option money
e.g. call       selling,          securities to      price     American,       date     paid/received
option          purchasing,       which the option             European etc.            per unit (GBP)
                varying etc.      relates (GBP)


(ii) Exercising

Product name, e.g.  Number of           Exercise price per
call option         securities          unit (Note 5)




(d)  Other dealings (including new securities) (Note 4)


Nature of transaction Details           Price per unit
(Note 8)                                (if applicable)
                                        (Note 5)




4.   OTHER INFORMATION
None

Agreements, arrangements or understandings relating to options or derivatives


Full details of any agreement, arrangement or understanding between the
person disclosing and any other person relating to the voting rights of
any relevant securities under any option referred to on this form or
relating to the voting rights or future acquisition or disposal of any
relevant securities to which any derivative referred to on this form is
referenced.  If none, this should be stated.




Is a Supplemental Form 8 attached? (Note 9)                 YES


Date of disclosure                         18 December 2007
Contact name                               Geoff Smith
Telephone number                           020 7116 2913
If a connected EFM, name of
offeree/offeror with which connected
If a connected EFM, state nature of
connection (Note 10)


Notes

The Notes on Form 8.3 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk

SUPPLEMENTAL FORM 8

DETAILS OF OPEN POSITIONS
(This form should be attached to Form 8.1, Form 8.1(b)(ii) or Form 8.3, as appropriate)

OPEN POSITIONS (Note 1)
Product name,     Written or  Number of securities   Exercise price   Type, e.g.     Expiry date
e.g. call option  purchased   to which the option    (Note 2)         American,
                              or derivative relates                   European etc.
Option            Purchased   250                    3,300.0000       EURO 21/12/2007
Option            Purchased   -1,000                 3,500.0000       EURO 21/12/2007
Option            Purchased   -500                   4,400.0000       EURO 21/12/2007
Option            Purchased   -350                   5,200.0000       EURO 21/12/2007
Option            Purchased   -306                   4,200.0000       EURO 21/12/2007
Option            Purchased   -300                   3,800.0000       EURO 20/06/2008
Option            Purchased   -300                   6,000.0000       EURO 21/12/2007
Option            Purchased   -275                   4,800.0000       EURO 21/12/2007
Option            Purchased   -250                   2,500.0000       EURO 20/06/2008
Option            Purchased   -250                   5,200.0000       EURO 20/03/2008
Option            Purchased   50                     5,400.0000       EURO 20/03/2008
Option            Purchased   100                    5,600.0000       EURO 18/01/2008
Option            Purchased   125                    4,400.0000       EURO 20/06/2008
Option            Purchased   -100,000               30.0000          AMER 20/06/2008
Option            Purchased   250                    3,000.0000       EURO 20/06/2008
Option            Purchased   -300,000               56.0000          AMER 15/02/2008
Option            Purchased   250                    3,800.0000       EURO 20/06/2008
Option            Purchased   250                    4,500.0000       EURO 21/12/2007
Option            Purchased   250                    6,000.0000       EURO 15/02/2008
Option            Purchased   250                    6,000.0000       EURO 15/02/2008
Option            Purchased   275                    5,000.0000       EURO 21/12/2007
Option            Purchased   306                    4,800.0000       EURO 21/12/2007
Option            Purchased   350                    4,600.0000       EURO 19/12/2008
Option            Purchased   350                    4,600.0000       EURO 19/12/2008
Option            Purchased   450                    3,500.0000       EURO 21/12/2007
Option            Purchased   500                    5,200.0000       EURO 21/12/2007
Option            Purchased   200,000                60.0000          AMER 18/01/2008
Option            Purchased   -600,000               42.0000          AMER 21/12/2007
Option            Purchased   -300,000               52.0000          AMER 15/02/2008
Option            Purchased   125                    4,400.0000       EURO 20/06/2008



Notes

1. Where there are open option positions or open derivative positions (except for CFDs), full details should be given.
Full details of any  existing agreements to purchase or to sell  should also be given on this form.

2. For all prices and other monetary amounts, the currency must be stated.

For details of the Code's dealing disclosure requirements, see Rule 8 and its Notes which can be viewed on the Takeover
Panel's website at www.thetakeoverpanel.org.uk